Recommend your favorite 360 games to me...

I've had an xbox 360 going on a couple years now...I have Gears of War, Deadrising, Virtua Tennis 3, Dark Sector, Full Auto, Burnout Revenge, Lost Planet, Tetris Evolutions, Prey and some others I can't think of right now...I really enjoyed every game I've purchased so far...I also just downloaded a demo for Too Human last night...I'm not quite sure if it lives up to all the hype that has been going on for it for the last year or whatever, but it seems like a game that I could get addicted to if I buy it and played through the whole game rather than just the demo...Anyway, back to the point...Any suggestions for new games anyone???
-Mike

Rainbow Six Vegas 2! I love it! Haha, can you tell I'm a bit obsessed with it? I also really enjoyed Army of Two despite what some people have been saying about it. Halo 3 is alright but not amazing. I love Burnout Revenge and Gears of War - you've got awesome taste dude ;)

I've never been to into the Halo series...But, I've also never played it multiplayer, and from what I've heard, the multiplayer and online modes are way more fun than the campaign mode...Maybe I'll give it a try, seeing as Halo 3 has been out for a while now, I can probably grab a pretty cheap used copy...Thanks!
-Mike